Registration Dossier
Registration Dossier
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EC number: 221-641-4 | CAS number: 3173-72-6
Endpoint summary
Administrative data
Description of key information
Additional information
Physical state
The substance is a white to yellowish organic solid with an aromatic odour.
Melting point
The melting point of the substance is 127 °C.
Boiling point
The boiling point of the substance is 167 °C at 7 hPa (NIOSH, 1998).
Density
The relative density of 1,5 -naphthylene diisocyanate is 1.41 at 20°C. The determination of the relative density was performed according to OECD 109.
Granulometry
The particle size distribution of the product Desmodur 15 was measured by means of a dry dispersion technique as combined sieving and laser diffraction. 82 % of the particles were > 875 µm, 16.73 % of the particles were
Vapour pressure
The vapour pressure of the substance is 0.000008 hPa at 25 °C. The vapour pressure was determined by the gas saturation method according to OECD 104 and is determined using optimized Antoine equation
Partition coefficient
Data waiving: In accordance with column 2 of REACH Annex VII, the test cannot be performed, as the substance decomposes in water within a hour (half-time approx. 1 hour).
The calculated partition coefficient (KOWWIN v 1.66) on the basis of the structural formula of 1,5 -naphthylene diisocyante is 4.37. The measured log Pow of the corresponding amine is 0.91.
Water solubility
In accordance with column 2 of REACH Annex VII, the study does not need to be conducted as the substance is hydrolytically unstable at pH 4, 7 and 9 (half-life < 1 hour).
Surface tension
Data waiving: In accordance with column 2 of REACH Annex VII the study does not need to be conducted. Based on structure the surface activity is not expected or can be predicted, or is a desired property of the material, as well.
Flash point
Performing of a study is scientifically not necessary. By definition, the flash point is the lowest temperature at which a liquid evolves vapours in such an amount that a flammable vapour / air mixture is produced. 1,5-naphthylene diisocyanate is a solid a ambient temperature with a melting point of 130°C. Therefore, the hazard of the flash point is described by the flammability.
Self-ignition temperature
According to column 2 of REACH regulation the study does not need to be conducted as the melting point of the substance is
Flammability
The substance is non-flammable.
Explosiveness
It can be concluded by expert judgement that 1,5 -naphthylene diisocyanate is not explosive. The determination according to EC Guideline A 14 is not necessary
Oxidising properties
It can be concluded by expert judgement that the criteria for classification of 1,5 -naphthylene diisocyanate as ‘oxidizing substance’ are not fulfilled. The determination according to UN Test Procedure O.1 is not necessary
Stability in organic solvents
In alcohol, urethanes were formed by isocyanates.
Dissociation constant
In accordance with column 2 of REACH Annex IX, the study does not need to be conducted as the substance is hydrolytically unstable (half-life is < 1 hour).
Viscosity
The study does not need to be performed as the test item is a solid.
Information on Registered Substances comes from registration dossiers which have been assigned a registration number. The assignment of a registration number does however not guarantee that the information in the dossier is correct or that the dossier is compliant with Regulation (EC) No 1907/2006 (the REACH Regulation). This information has not been reviewed or verified by the Agency or any other authority. The content is subject to change without prior notice.
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